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When the engine is cold, it starts only at second or third attempt and outside is smelling gasoline. After the engine starts and car runs, after about 100 meters, the engine loses a lot of power, more than half, and keeps running like this. Only very rarely, maybe ~5% of time, when I’m in second or third gear at about 2000 RPM the engine works at normal power but after about 3000 RMP the engine loose power again, but as I said those cases are happening very rarely. At IDLE, the car can rev to maximum RPM but on the road, I cannot pass 100 km/h.

Special Notes:
When found in VW Polo (9N) with 1.4l FSI (AXU), check Technical Product Information (TPI) 2009218 which describes a problem with the Fuel Pump (G6).

Description:
The Fuel Pressure Sensor (G247) is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.

Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.

Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the Powertrain Control Module (PCM). This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

The Fuel Pressure Sensor (G247) measures the pressure of the fuel near the fuel injectors. This signal is used by the Powertrain Control Module (PCM) to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Sorry but I didn't knew that more details are needed about the car. The engine is BKG. My mechanic tried what I mentioned in the beginning but then recommended me to go with the car to an electrician because he suspects that the problem is electrical. I depend on my car to make the commute to work. Where I live, the electricians keep the cars in their shop long time (at least a week) which is really hard for me to do this. I'm a robotics engineer so I know some electronics and mechanics. I want to try to fix it myself before I leave it to an electrician.

But the low pressure seems ok. I'm wondering, is the 4.5 bar in high pressure rail enough for the car to run? If not, then clearly the signal from high pressure sensor is not ok and could be some wiring or ecu problems since the sensor is new.